diff --git a/extend/lbson/src/bson.h b/extend/lbson/src/bson.h
index 31f70e1b..21808e64 100644
--- a/extend/lbson/src/bson.h
+++ b/extend/lbson/src/bson.h
@@ -181,13 +181,13 @@ namespace lbson {
             return sprintf(str, "%zd", i);
         }
 
-        void write_int64(lua_State* L) {
+        void pack_int64(lua_State* L) {
             lua_getfield(L, -1, "value");
             m_buffer.write<uint64_t>(lua_tointeger(L, -1));
             lua_pop(L, 1);
         }
 
-        void write_string(lua_State* L) {
+        void pack_string(lua_State* L) {
             size_t data_len;
             lua_getfield(L, -1, "value");
             const char* data = lua_tolstring(L, -1, &data_len);
@@ -195,7 +195,7 @@ namespace lbson {
             lua_pop(L, 1);
         }
 
-        void write_binary(lua_State* L) {
+        void pack_binary(lua_State* L) {
             lua_guard g(L);
             size_t bin_len;
             lua_getfield(L, -1, "binrary");
@@ -206,7 +206,7 @@ namespace lbson {
             m_buffer.push_data((uint8_t*)bin, bin_len);
         }
 
-        void write_regex(lua_State* L) {
+        void pack_regex(lua_State* L) {
             lua_guard g(L);
             size_t regex_len;
             lua_getfield(L, -1, "pattern");
@@ -326,21 +326,21 @@ namespace lbson {
             case bson_type::BSON_NULL:
                 break;
             case bson_type::BSON_BINARY:
-                write_binary(L);
+                pack_binary(L);
                 break;
             case bson_type::BSON_DATE:
             case bson_type::BSON_INT64:
             case bson_type::BSON_TIMESTAMP:
-                write_int64(L);
+                pack_int64(L);
                 break;
             case bson_type::BSON_ARRAY:
             case bson_type::BSON_JSCODE:
             case bson_type::BSON_DOCUMENT:
             case bson_type::BSON_OBJECTID:
-                write_string(L);
+                pack_string(L);
                 break;
             case bson_type::BSON_REGEX:
-                write_regex(L);
+                pack_regex(L);
                 break;
             default:
                 luaL_error(L, "Invalid value type : %d", (int)type);
diff --git a/extend/lbson/src/lbson.cpp b/extend/lbson/src/lbson.cpp
index 55c3dfed..efad213e 100644
--- a/extend/lbson/src/lbson.cpp
+++ b/extend/lbson/src/lbson.cpp
@@ -57,6 +57,30 @@ namespace lbson {
         llbson.set_function("pairs", pairs);
         llbson.set_function("regex", regex);
         llbson.set_function("date", date);
+        llbson.new_enum("BSON_TYPE",
+            "BSON_EOO", bson_type::BSON_EOO,
+            "BSON_REAL", bson_type::BSON_REAL,
+            "BSON_STRING", bson_type::BSON_STRING,
+            "BSON_DOCUMENT", bson_type::BSON_DOCUMENT,
+            "BSON_ARRAY", bson_type::BSON_ARRAY,
+            "BSON_BINARY", bson_type::BSON_BINARY,
+            "BSON_UNDEFINED", bson_type::BSON_UNDEFINED,
+            "BSON_OBJECTID", bson_type::BSON_OBJECTID,
+            "BSON_BOOLEAN", bson_type::BSON_BOOLEAN,
+            "BSON_DATE", bson_type::BSON_DATE,
+            "BSON_NULL", bson_type::BSON_NULL,
+            "BSON_REGEX", bson_type::BSON_REGEX,
+            "BSON_DBPOINTER", bson_type::BSON_DBPOINTER,
+            "BSON_JSCODE", bson_type::BSON_JSCODE,
+            "BSON_SYMBOL", bson_type::BSON_SYMBOL,
+            "BSON_CODEWS", bson_type::BSON_CODEWS,
+            "BSON_INT32", bson_type::BSON_INT32,
+            "BSON_TIMESTAMP", bson_type::BSON_TIMESTAMP,
+            "BSON_INT64", bson_type::BSON_INT64,
+            "BSON_INT128", bson_type::BSON_INT128,
+            "BSON_MINKEY", bson_type::BSON_MINKEY,
+            "BSON_MAXKEY", bson_type::BSON_MAXKEY
+        );
         return llbson;
     }
 }